Multiple sound-record tablet



C. H. G|LL. MULTIPLE souwo RECORD TABLET.

APPLICATION FILED DEC-10, l9l9- Patented Aug. 29, 1922.

III/I arm) STATES PATENT OFFICE. I

CHARLES H. GILL, OF CHICAGO, ILLINOIS.

MULTIPLE SOUND-RECORD TABLET.

Specification of Letters Patent.

Patented Aug. 29, 1922.

Application filed December 10, 1919. Serial No. 343,945.

ducing machine, and it relates more specifically to tablets of the type referred to above whereon sound records are carried upon each of its opposite faces.

The objects of my improvement are, first, to provide means for securing together two thin sound record tablets, having sound records upon one side of each, with the record carrying sides of each tablet outwards; second, to provide a strengthening plate between the twothin tablets aforesaid, with means for securin the said tablets to opposite sides of the said plate and for removing and changing said tablets at will; third, to provide means for protecting said tablets 'from breakage by preventing their direct .contact with any surface they might fall upon; and, fourth, to provide means for carrying the reproducing stylus out of contact with the sound record upon said tablets during the first several rotations of said tablets, While the said tablets are accumu lating speed, and to bring about operative contact between said stylus and said sound records after a pred etermined number of rotations of said tablets.

The particular advantages claimed for my invention are that it will allow of the selection by the purchaser of the specific sound records upon each side of the double faced records or tablets instead of having to select the particular record wanted and take whatever may have been put upon the opposite side by the manufacturers; also the protection against breakage and warping of the tablets which it affords and the ad- Vantage of allowing the tablet to attain full rotational speed before contacting with the reproducing stylus.

I attain the objects set forth above by the construction set forth in the accompanying in which- Figure 1 is a plan View of my multiple sound record tablet; Figure 2 is a section taken through the center of Figure 1; Figure 3 is an enlarged fragmentary section taken on the line 3-3 of Figure 1; Figure 4 is an enlarged fragmentary plan view of a part of Figure l; and Figure 5 is an enlarged cross section of the central part of the multiple sound record tablet, illustrating an alternative construction.

Similar numbers refer to similar parts throughoutthe several views.

Two very thin disks 11, of the usual rec'- ord tablet composition or other suitable material, each carry upon their surface a helical record groove 12. A supporting and stiffening plate 13, of metal or other material, is of circular shape and of somewhat greater diameter than the record disks 11, so that the outer edge 14 of the plate 13 extends somewhat beyond the outer edges 15 of the record disks 11 when the said record disks are centered upon the plate 13. The plate 13 and the record disks 11 are each provided with small circular openings extending through their centers. These openings are designated as 16 in the plate 13 and as 17 inthe record. disks 11. T e openings 16 and 17 are either of like diameter or the opening 16 is of somewhat greater diameter than the openings 17.

Rings 18 and 19 are preferably made of metal and are somewhat greater in outside diameter than the plate 13 and somewhat less in inside diameter than the diameters of the record disks 11. The rings 18 and 19 are relatively thick at their outer edges and taper to thinness at their inner edges 20. The said rings are further constructed with shoulders 24 of height corresponding to the thickness of the record disks 11 and adaptedto fit around the outer edges 15 of said record disks; also with shoulders 25 adapted to fit over the outer edge 14 of the plate 13. The inner edges 20 of the rings 18 and 19 overlap the record disks 11.

Screws 21 pass through circular and internally threaded openings 22 in the rings 18 and 19 and through similarly {internally threaded openings 23 in the plate 13, all beyond the outer edges of the record disks 11.

The two record disks 11 are selected by the purchaser and are then clamped to the ring 19 1s laid flat with its shoulders uppermost. Qne of the record disks 11 is then laid inside the shoulder 24 and with its record-face downwards. The plate 13 is then laid upon the record disk 11 and within the shoulder 25 of the ring 19. The other record disk 11 is now laid upon the plate 13 with its record face upwards and the ring 18 is fitted over it so that the shoulder 24:

of the ring 18 fits around the outer' edge of the record disk 11 and the shoulder 25 fits around the outer edge 14 of the plate 13.

The ring 18 is then turned until its threaded openings 22 are in alignment with the threaded openings 23 in the plate 13 and with the threaded openings 22 in the ring 19. The screws 21 are now screwed through the two rings 18 and '19 and the plate 13 and so tightened as to hold the record disks 11 securely. The heads of the screws 21 fit into countersunk depressions in the ring 18.

Two or more convolutions of a helical groove 26 are provided in the surfaces of the rings 18 and 19 near their inner edges 20. These helical grooves 26 run ofi of the rings 18 and 19 at their inner terminations.

After having been clamped together my multiple sound record tablet may be used upon a sound reproducing machine exactly the same as any other double faced record tablet. When it is desired to also employ the stylus carrying feature, the stylus needle is placed in the outer convolution of the helical groove 26 in the ring ,/18 or 19 while the machine is at rest. When the rotation of the table carrying the record tablet I is started, the stylus needle will follow the groove 26 during the first few rotations, while normal playing speed is being attained, and will run off onto the record grooves in the record disk when it reaches the termination of the groove 26.

An alternative method of clamping the two record disks and the plate 13 together is illustrated in Figure 5. A supporting and stifi'ening plate 13 carries the record adapted to screw into an internally threaded central opening 29 in the plate 13. The inside of the collars 28 constitute an opening of the usual sizefor receiving the centering pin of the table of the sound reproducing machine.

It will be evident that numerous other means might be employed to accomplish the purposes of this invention. T do not, therefore, limit my invention to the constructions described, its limitations being only those of the following claims.

I claim:

1. In a multiple sound record tablet, the

record carrying disks provided with central openings through them, circular depressions in said record carrying disks surrounding said openings through said disks, circular plates adapted to fit into said depressions and threaded collars upon each of said plates adapted to secure one of said record carry- -ing disks upon each side of the said central supporting disk.

3. In a multiple sound record tablet, the combination of two separate record carrying disks of such thinness as to be impractical for ordinary usage without reinforcement, a supporting disk of relatively strong construction and of such greater diameter than the said record carrying disks as to protect the edges of said record carrying disks and means for securing one of said record carrying disks to each side of the said supporting disk. I

4. In a multiple sound record tablet. the combination of a supporting disk, record carrying disks adapted to be secured to each side of said supporting disk, two rings having edges adapted to overlap the edges of the said record carrying disks and shoulders adapted to fit around the edges of said record carrying disks and means for securing said rings together and to the said supporting disk and to centrally secure one of said record carryingdisks upon each side of said supporting disk.

1 cnannns H. GILL. 

